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Which App drains my battery ?
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F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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You should be able to just go to Settings > Battery and seeing the battery usage of your phone broken down by apps.
Unfortunatly not. Guess it's a Huawei thing. With my old Samsung it works like that.
You could install a app like accu battery which can read those stats from the android api.